package com.mlethe.library.widget.clearedit;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnFocusChangeListener;

import androidx.appcompat.widget.AppCompatEditText;
import androidx.core.content.ContextCompat;
import androidx.core.graphics.drawable.DrawableCompat;

/**
 * 带删除的输入框
 * @author Mlethe
 */
public class ClearEditText extends AppCompatEditText implements OnFocusChangeListener {
    /**
     * 删除按钮的引用
     */
    protected Drawable mClearDrawable;
    /**
     * 控件是否有焦点
     */
    protected boolean hasFoucs;

    private OnDeleteClickListener mOnDeleteClickListener;

    private ClearTextWatcher mClearTextWatcher;

    public ClearEditText(Context context) {
        this(context, null);
    }

    public ClearEditText(Context context, AttributeSet attrs) {

        //这里构造方法也很重要，不加这个很多属性不能再XML里面定义
        this(context, attrs, android.R.attr.editTextStyle);
    }

    public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(context);
    }


    protected void init(Context context) {
        //获取EditText的DrawableRight,假如没有设置我们就使用默认的图片
        mClearDrawable = getCompoundDrawables()[2];
        if (mClearDrawable == null) {
            final Drawable drawable = ContextCompat.getDrawable(context, R.drawable.icon_delete);
            final Drawable wrapDrawable = DrawableCompat.wrap(drawable);
            DrawableCompat.setTint(wrapDrawable, getCurrentHintTextColor());
            mClearDrawable = wrapDrawable;
        }
        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());
        //默认设置隐藏图标
        setClearIconVisible(false);
        //设置焦点改变的监听
        setOnFocusChangeListener(this);
        mClearTextWatcher = new ClearTextWatcher();
        //设置输入框里面内容发生改变的监听
        addTextChangedListener(mClearTextWatcher);
    }


    /**
     * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件
     * 当我们按下的位置 在  EditText的宽度 - 图标到控件右边的间距 - 图标的宽度  和
     * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向就没有考虑
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_UP && getCompoundDrawables()[2] != null) {
            boolean touchable = event.getX() > (getWidth() - getTotalPaddingRight())
                    && event.getX() < getWidth() - getPaddingRight();
            if (touchable) {
                this.setText("");
                if (mOnDeleteClickListener != null) {
                    mOnDeleteClickListener.onClick();
                }
            }
        }
        return super.onTouchEvent(event);
    }

    /**
     * 当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏
     */
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        this.hasFoucs = hasFocus;
        if (hasFocus) {
            setClearIconVisible(getText().length() > 0);
        } else {
            setClearIconVisible(false);
        }
    }

    @Override
    public void addTextChangedListener(TextWatcher watcher) {
        if (watcher instanceof ClearTextWatcher) {
            super.addTextChangedListener(watcher);
        } else {
            mClearTextWatcher.setTextWatcher(watcher);
        }
    }

    /**
     * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
     * @param visible
     */
    public void setClearIconVisible(boolean visible) {
        Drawable right = visible ? mClearDrawable : null;
        setCompoundDrawables(getCompoundDrawables()[0],
                getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
    }

    /**
     * 设置监听事件
     * @param onDeleteClickListener
     */
    public void setOnDeleteClickListener(OnDeleteClickListener onDeleteClickListener) {
        this.mOnDeleteClickListener = onDeleteClickListener;
    }

    public interface OnDeleteClickListener {
        /**
         * 点击删除图标
         */
        void onClick();
    }

    private class ClearTextWatcher implements TextWatcher {

        private TextWatcher mTextWatcher;

        public ClearTextWatcher() {
        }

        public void setTextWatcher(TextWatcher textWatcher) {
            this.mTextWatcher = textWatcher;
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            if (mTextWatcher != null) {
                mTextWatcher.beforeTextChanged(s, start, count, after);
            }
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            if (hasFoucs) {
                setClearIconVisible(s.length() > 0);
            }
            if (mTextWatcher != null) {
                mTextWatcher.onTextChanged(s, start, before, count);
            }
        }

        @Override
        public void afterTextChanged(Editable s) {
            if (mTextWatcher != null) {
                mTextWatcher.afterTextChanged(s);
            }
        }
    }
}
